You should remove it by their proper Quick Heal removal tool.If you try to uninstall it by add/Remove program, it doesn’t remove it completely, because some of security registries entries might be still remains, which can be create problems.
If you don’t use removal tool you might be facing the problem like: Computer freezing, Unable to connect internet, computer speed slow and also might be getting installation error. Download the removal tool and uninstall it completely.

I have installed QHTS 14 Trial version. my system was crashed before the trial period and hence I formatted the system. Now I am getting a message “ERROR INSTALLING QH internal error” while installing QH
Please guide

Sorry to say but we do not have any solution for this particular problem yet. But you can try, first uninstall it properly using its own removal tool (Quick Heal Removal Tool) and then try to reinstall it again.
How many days should be left under Trial period?

There are many antiviruses available over the internet and some are free but I prefer quick heal antivirus because I am using it from last 5 years and I had never face any problem or I can say big problem. Try it.

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